A f pott



A. F. POTT SHIFT DEVICE FOR CALCULATING MACHINES Jan. 10, 1939.

Filed Sept. 23, 1931 ll Sheets-Shegt l M P I H for Q Jan.

A. F. POTT SHIFT DEVICE FOR' CALCULATING MACHINES Filed Sept. 25, 1931 ll Sheets-Sheet 2 I5 l/IM A. F. POTT 7 Jan. 10, 1939.

SHIFT DEVICE FOR CALCULA'iING MACHINES F iled Sept. 25, 1931 ll Sheets-Sheet 3 x O r awwwwww Jan. 10, 1939. A. F. POTT v SHIFT DEVICE FOR CALCULATING MACHINES 11 Sheets-Sheet 4 Filed Sept. 23, 1931 Jan. 10, 1939. A. F POTT l 2,143,741

SHIFT DEVICE FOR CALCULATING MACHINES Filed Sept. 23, 1931 ll Sheets-Sheet 5 4.97 20/ fi yjwg/ ys A. F. POTT SHIFT DEVICE FOR CALCULATING MACHINES Jan. 10, 1939.

Filed saint. 2s, 1951 11 Sheets-Sheet s Jan. 10, 1939. PQTT SHIFT DEVICE FOR CALCULATING MACHINES Filed Sept. 25, 1931 11 Sheets-Sheet 7 Jan. 10,- 1939. A. F, Po'r SHIFT DEVICE FOR CALCULATING MACHINES Filed Sept. 23, 1931 11 Sheets-Sheet 8 Jan. 10, 1939. A. F. POTT 2,143,741

SHIFT DEVICE FOR CALCULATING MACHINES Filed Sept. 23, 1931 ll Sheets-Sheet 9 A. F. POTT SHIFT DEVICE FOR CALCULATING MACHINES Jab. 10; 1939.

11 Sheets-Sheet 10 Filed Sefit. 2a, 1951 Jan; 10, 1939.

A. F. POTT 2,143,741

SHIFT DEVICE FOR CALCULATING MACHINES Filed Sept 23, 1951 ll Sheets-Sheet l1 Patented Jan. 10, 1939 v I UNITED STATES PATENT OFFICE SHIFT DEVICE FOR CALCULATING MACHINES August Friedrich Pott, Zella-Mehlis, Germany, assignor to Mercedes Buromaschinen-Werke Aktiengesellschaft, Benshausen, Germany Application September 23, 1931, Serial No. 564,643 In Germany October 2, 1930 Claims. (Cl. 235-63) The invention relates to a controlling device for the purpose of better illustration of the individual calculating machines. mechanisms.

The primary object of my invention is to equip Figure 6d shows a detail of the arrangement a calculating machine of this type for the peraccording to Figure 6a likewise on an enlarged 5 formance of addition and subtraction and to proscale. 5 vide efficient controls of simplified construction Figure 7 shows a draw -key clutch for the for conditioning the machine for operation as change gear of the tens carrying shaft of the above specified. revolution counter, in which the diilerent parts Another object is to equip a calculating mafor the sake of clearness are separated out of one chine with a control mechanism, by means of another. 10

which either of the addition and subtraction keys Figure 7a shows a section through the change are controlled to release the main driving shaft gear of the revolution counter on an enlarged for one rotation only regardless of whether the cale.

keys are held depressed or not, or by means of Figure 8 shows a plan of th change 8 which the main driving shaft is maintained in the tens-carrying shaft of the revolution counter, 15

rotation as long as the keys are held depressed. in which the shafts of the wheels for the sake of Other and subordinate object are 9,15 mclearness are represented in substantially one prised in my invention all of which together with plane.

the exact nature of my improvements will be Figure 9 shows a perspective view of the main readily understood when the following descripdrive shaft, with the clutch for the value enter- 20 tion and claims are read with reference to the ing mechanism and the carriage clutch viewed in drawings accompanying and forming part of the direction of the arrow bin Figure 3, with the this specification. parts separated out from one another.

In the drawings, one form of construction ac- Figure 10 is a view in side elevation of one of cording to the invention is illustrated by way of said carria e S t c utches. 25 example as applied to a Mercedes-Euclid-calcu- Figure 11 is a plan view of clutch mechanism lating machine as described in Patent No. 1,011,- iler tiv ly related to t e va ue entering c 617. anism of the machine for effecting the entry in Figure 1 shows a front view in perspective of the the accumulator of values set up in the keyboard, machine in which for the sake of clearness the together with the tens carrying shaft for the 30 cover plate of the register carriage is partly latter and driving parts for said shaft. removed. Figure 12 shows a partial side elevation accord- Figure 2 shows a front elevation in perspective ing to Figure 11. of the machine according to Figure 1, the register Figure 13 shows a perspective view of the macarriage being, however, turned upwards rearchine taken from the front right-hand side of 35 wards. the mechanisms controlled by the addition and Figure 3 shows a rear view in perspective of the action key together with the mom! machine in which the rear cover plate is removed. tact and a part of the driving motor, in which the Figure 4 shows a view of the main drive shaft parts for the sake of clearness are represented 40 with the clutch for the value entering mechanism separated out of one another. 40

and the carriage shift clutch, viewed in the direc- 1 Figure 14 shows a perspective view of the retion of the arrow d shown in Figure 2. setting mechanism for the keyboard automat- Figure 5 shows a partial view of Figure 4 ically controlled by the addition or subtraction viewed however, in the opposite direction to the key.

arrow din Figure 2. Figure 15 shows a view of a section throug 45 Figure 6 shows a side view of Figure 4 viewed the carriage along the line l5l5 in Figure 1, in the direction of the arrow a in Figure 4. viewed in the direction of the arrows.

Figure 6a shows a front view of the tens carry- Figure 16 shows a section through the carriage ing shaft for the revolution counter viewed in the along the line lS-IG in Figure 1 iewed in the direction of the arrow a in Figure 2. direction of the arrows. 50

Figure 6b shows the development of the periph- Figure 17 shows a detail view of overthrow cry of the tens carrying shaft according to preventing means for the revolutions counter. Figure 6a. Figure 18 is a perspective view of key locking Figure 6c shows a plan of the numeral wheels of echanism value entering mechanism. fl i t the revolution counter onan enlarged scale for mechanism for effecting operation of the value 55 arranged on the right hand side of the shaft i9 70 entering mechanism to enter values in the accumulator and the locking rail for the tens carrying preparatory member.

Figures 19 and show different positions of the control lever for the draw key clutch of the change gear for the revolution counter and show Figure 19 the position in the normal addition operation.

Figure 20 the position in the normal subtraction operation.

Figure 21 shows a part plan of the tens-carrying parts, viewed in the direction of the arrow l? in Figure 15, with partly exposed preparation members and numeral wheel shafts.

Figure 22 shows a part of the tens carrying members withtheir guides and without their cover part, viewed in the direction of the arrow 9 R in Figure 15.

Figure 23' shows a tens carrying member in perspective view.

.- General description The motor D (Figures 3 and 13) is removably I attached on the rear side of the machine. The rotations of the motor D revolving in the direction of the arrow el are transferred through a worm 1, (Figure 13) and a worm wheel 2, to a main drive shaft 3 (Figures 3 to 6 and 9). The main drive shaft 3 is thus rotated in the direction of the arrow e (Figures 3, 4 to 6, 9 and 13).

On the right hand side of the machine, (Figures 1, 2, 13) an addition key 6 is disposed, a subtraction'key 5, a keyboard resetting key t, which is indicated by RK, an accumulator resettingkey i which is indicated by RA, a revolution counter resetting key 9, which is indicated with Rae and a lever 9, by means-of which either of the addition and subtraction keys 6 and 5 is controlled to release the main drive shaft 3 for one rotation only regardless of whether the keys are held depressed or not (position A, Figure 1 of the lever 9) or by means of which the main driving shaft is main-,

tained in rotation as long as the keys areheld depressed (position M, Figure l of the lever 9).

On the left hand side of the machine the key it for shifting the carriage to the left and the key M for shifting it to the right, are disposed, a division key 2 for controlling division processes, a division correction -key it for controlling correction of division processes, a minus multiplication key I d and a plus multiplication key i5, respectively for operating the accumulator A and also the revolution counter RC, subtractively and additively, respectively, a correction key it for controlling the engagement or reversing the calculating sense of the revolution counter RC, a multiplication lever ll, for automatically performing the kind of multiplication, a key i 8 operated prior to the lever ll for performing automatically multiplication and operating the accumulator A and the revolution counter RC subtractively; and a rotatable knob (not shown) (Figs. 1, 2 and 11) adapted to be replaced by a hand crank for operating the machine in case of failure of the motor.

The main drive shaft 3 (Figures 4, 5, 6, 9 and 13) is as already mentioned driven in the direction of the arrow e by the ,worm wheel 2 which *tion as engages with the worm t. On the main drive.

shaft 3 a cam 26 (Figures 4, 5) formed with a conically extending circumference, is non-rotatably mounted, which cam acts on an arm 2| (Figure 13) of a two-armed contact lever 22; The

arm 2i in its rest position lies on the conical circumference 23 of the cam 20, and is held in this position by means of a spring 29% attached at one end to 2. lug Zia of the arm 2|, of the lever and at its other end to a nose 295a of a lever Further, a toothed wheel 26 (Figures 4, 5 and 9) and a clutch housing for-the'carriage shift clutch, rigidly inter-connected with the toothed wheel; are rotatably mounted on the main driveshaft 3. Within the clutch, housing 25 a cam 29 is pinned to said shaft 3, which rests with its,

side 27 against the inner wall of the housing 25. On a segment-like projection 29 (Figures 9 and 10) of the clutch housing 26, a ring 33 is fixed by means of screws 29 and 39, (Figures 4 and 5) at the points 3! and 92 (Figure 9), which ring is provided with a suficiently large bore 36, so that the cam 26 rigidly mounted on the main drive shaft 3 can freely rotate therein. Between the clutch housing 25 and the ring 33, a trip pawl 3'11 is swingably mounted by means of a pin Bid in the hole 35 of the housing 25 and in the hole 38 of the ring 33. The trip pawl 3i is by means of a spring so acted on in the direction of the arrow e, the spring at one of its ends being attached to a nose at of the trip pawl 37! and at its other end to a pin 39 fixed to the inner side of the housing 25. A nose ill of the trip pawl 37 abuts on a face 9'2 (Figure 4) of a clutch tripp dog 38. On the circumference of the projection 28 of the clutch housing 25, a cam 25a is provided.

On the trip pawl 3i, a coupling nose M is fur ther arranged, which co-acts with a nose M5 of the cam 28. In order to hold the coupling nose 36 out of engagement with the nose Q5 of the c 25, the housing 25 is provided on its outer circumference with two grooves 46 and ill, in which a pawl 98 engages, which pawl at its other end is constructed of fork shape, and this fork shaped constructed part isswingably arranged in a cir= cumferential groove of a shaft 99. By m ofa spring 59, which at one end is attached to a nose 5! of the pawl 58 and at its other end is attached the same is held in its rest position as represented in'Figure 10.

Further, on the shaft 3, the clutch ho 52 (Figures 4, 5, 9 and 13) is fixed, which likewise has a segment-like projection 53. Theclutch housing 52 is clamped by means of jaws 94 provided on it and both of the screws 55 to a hub 55L provided on a gear 58, whereby the clutch housing 52 is rigidly connected to the gear 96 and in common with the same is rotatable on the main drive shaft On the segment-like projecof the clutch housing 52, a ring 58 i8 fastened by means. of the'screws 59 and 99 (Figure 4) which engage with the holes 6i. This ring 53 has a bore'ti which is chosen so large that the cam 26 can freely rotate in it. The cam 28 rests with its side 69 against the inner wall of the clutch housing 52.

Between the clutch housing 52 and the ring 58, 'a trip pawl 65 is arranged in a hole 64 of the same and in a hole not'represented in the clutch housing 53, the pawl being swingably mounted by 26 grooves I2 and I3 are formed in the clutch housing 52. With the grooves I2 and I3 a pawl I4 may engage which at its other end is of fork shaped construction, and this fork shaped end is swingably arranged in a ring groove I5 of the shaft 49. By means of a spring I6, which enages with a nose II of the pawl I4, the latter is acted on in a clockwise direction. If the pawl I4 engages with the groove I2 of the clutch housing 52, the latter is situated in its rest position.

The gear 56, which is connected with the clutch c' sing 52, engages with a gear I8 (Figures 4 and on which a bevel gear 19 is formed.

The main drive shaft 3 is rotatably mounted in bearings in the rear wall 88 (Figure 4) and in a hub 8| (Figure 4) of a plate 82, fixed to the machine frame.

Perpendicular over and parallel to the "main drive shaft 3, (Figure 4) the driving shaft H6 or the value entering mechanism (Figures 4 and 11) is rotatably mounted in bearings in the ma-v chine frame. The gear I8 fixed on the shaft H6 and the bevel gear I9 formed on the gear, as well as the shaft H6, obtain their drive from the motor D through the parts I, 2 (Figure 13) the clutch of the value entering mechanism 26, 65 (Figure 9) and the toothed wheel 56, as already described, and rotate them in the direction of the arrow f indicated in Figures 6 and 11,

On the shaft II 6, a crank disc II1 (Figures 4, 6, 13 and 18) is rigidly mounted. On this disc a crank pin H8 is provided, on which an adjustable connecting bearing is arranged consisting of a disc I28 provided with a suitable number of grooves I9. On the disc I28 and on its side which is remote from the disc III a lateral cone I2I is provided, which serves as the inner ball bearing running ring. The disc I28 and the cone IZI are provided with a hole corresponding to the diameter of the crank pin H8, and arranged eccentricallytothe cone I2I. 'On the disc-like crank arm 1, there is riveted a pin I22 which engages with a groove I I9 of the disc I28 and thereby prevents an automatic distortion of the ball bearing running ring I28, I2I. Between the conical part- I2I of the ball bearing running ring I28, I2I and the cylindrical inner running surface I23 of the connecting rod head I25 of the connecting rod I24, the balls which are not illustrated are inserted. These are prevented from falling out by means of a cover disc I25a, which by a nut I26, is pressed against the front side of' the cone I2I. By means also of the cover disc I25a, the connecting rod head of the connecting rod I24 is held in position. The connecting rod I24 is interconnected with the proportional lever which is described in U. S. Patent 1,011,617 and indicated there by the reference I and which drives the system of differentiating movable racks 338 to 338g, 33I (Figs. 13, 18) partly represented in Fig. ure l8 and comprising the value entering mechanism of the machine.

The crank disc II'I, (Figures 13 and 18), is provided with a recess II'Ig, into which projects a right angled bent lug In, of a lever II'Im, swingable on the machine frame on a pin IIIk.

The lever IIIm is rigidly connected by means of a bridge II'In with the lever IIIp, which is likewise swingably mounted on the pin lie. The lever IIIp rests underneath a key locking bar which will be later described in a more detailed manner.

The bevel gear I9 (Figures 4 and 11) formed on the gear I8, engages with a bevel gear I2'I, rigidly mounted on the tens carrying shaft l9, of the accumulator A. Further, on said shaft I9 to the left-hand side of the bevel gear I21, 9. gear I28 is rigidly mounted, which engages with a gear I29 (Figures 4, 6, '7 and 8) the gear I29, being carried by means of a sleeve by the draw key I38 (Figure 7).

The tens carying shaft I9, (Figures 11 and 12) carries eccentrics I3I which act on tens carrying member I33 (Figs. 15, 16, 18, 22 and 23) of the accumulator A displaceable in a beam I32. On the left-hand side of the tens-carrying shaft I9 (Figures 11 and 12) a pin gear I34 is rigidly mounted. The same consists of two discs I35 and I36 between which pins I31 and a locking piece I38 are inserted. The pins I31 and the locking piece I38 act on a two part Maltese cross I39, which is rotatably-mounted on the shaft I48, mounted in bearings in the machine frame. With the Maltese cross I39, a gear MI is rigidly connected, and engages with an intermediate gear I43 rotatable on a shaft I42. The intermediate gear I43 engages with a gear I46, fixed to a pin I44 of a coupling gear frame I45. Said frame I45 consists of twoend pieces of which the left-hand end piece I" is represented in Figures 11 and 18. The right-hand end piece I48 is indicated in Figure 18 and is likewise provided with a pin I49, which is mounted ina bearing in a part I58 fixed in the machine frame.

Both of the end pieces are inter-connected by means of bars I5l and I52 between which the clutch wheels I53 are rotatably mounted on pins. Longitudinally of theframe I45 a locking bar, not shown, is provided, which with teeth engages in the tooth spaces of the coupling gears I53, and. 1

in this manner prevents a rotation of the same with the gears I54 and I55 (Figures 15 and 18) whilst in their uncoupled positions. The locking bar is fully disclosed in my Patent No. 1,935,858, filed April 6, 1931, and is there designated by reference numeral 2I'I.

The gear I28 (Figures 4, 8 and 11) engages with the above mentioned gear I29 (Figures 7 and 8), loosely and rotatably on a draw key sleeve I56 (Figures 7 and 7a) in which gear I29 a groove I68 is formed and of which the hub I29a is provided with an enlarged bore corresponding to the groove I68. Further on the draw key sleeve I56 a second gear I5'I is loosely and rotatably mounted, which is provided with an enlarged bore I6I corresponding to the groove I68 of the gear I29 and in the hub I5'Ia. of which a groove I6'I is formed. Between the two gears I29 and I5'I a disc I58 (Figures 4 and 7) constructed as a fork, is arranged, which disc is provided with'a groove I58a and which with its fork-like end embraces the shaft I59 (Figure 4). By means of this arrangement, it is possible to couple the toothed wheel III sometimes with the gear I29, by means of the draw key I38, of which the part I63 slides in the groove I62 of the draw key sleeve I56, and at other times with the gear I51. If the draw key is situated in the middle position indicated in Figure 7a, the gears I29 and I5'I can, without influencing the gear III, rotate on the sleeve I58.

. of the spring I85 around the pin I88. The lever engages with its end'28i, in a recess.282 of the the bottom of the groove 288.

' moment, for

P in an eventual rotation of' the The draw key sleeve I 58 is rotatably mounted on the right in a box I88 (Figure 7) and on the left by means of a projection I88, in the bearing piece I88.

The arm I81 (Figures 2 and '7) of the draw key setting belt crank I88, swingably mounted on the machine frame by means of a pin I88, engages in a ring groove I18, of the draw key I88, and displaces this axially, so that the part I88 of the draw key sometimes may come into the working position in relation to the gear I28 and sometimes into the working position in relation to the gear I51. On the left adjacent to the gear I28, the toothed wheel IN is provided on the draw key sleeve I 88, which gear engages with a gear I18 rigidly mounted on the tens carrying shaft I12 of the revolution counter RC. The tens carrying shaft I12 (Figure 6a) is at its right and left-hand ends rotatably mounted on the machine frame by means of trunnions I18.

.The shaft I12 is maintained in its normal position by means of afpin I15 (Figure 6a). The pin I18 is acted on upwards by means of a spring I18, which at one end rests against the shoulder II! of the pin I15, and at its other end rests against the bearing part' I18. The pin I15 is guided in abearing part I18, and engages with a recess -I88 of the tens carrying shaft I12.

Further with the gear I28 (Figure 8) a gear I8I loosely and rotatably mounted on a shaft I88 (Figure 4) engages the gear I8I, being rigidly connected by means of a sleeve I82 with a gear I83, represented inFigure 8. The latter gear engages further with the already mentioned toothed wheel I51,

On the revolution counter driving and tens carrying shaft I12 (Figures 6a and 6b) transport pieces I84 to I849, are provided. The transport piece I84, situated furthest to the right, does not act immediately as such,but bothof,- its ends are providedwith spring operated slides I88 and I88, of which in the following only the slide I86 will be described in'detail. In Figure 6d the slide I88 is represented with the shaft I12 in section on an enlarged scale. This slide I88, which on its lower part I81 is of cylindrical form, is arranged so as to be vertically displaceable in a hole I88 of the shaft I12. It is providedwith a small lug 189, which is notched at I88, andlies in a groove I8I (Figure 6b) in front of the transport piece I84. The transport piece I84 is broadened by means of lug I88 (Figure 6b) so that the inclined face I84A'formed by the lug I88,

approximately is twice as broad as the transport 'I12, a spring- I is suspended by means of a piece I84. In. a second hole I83 in the shaft small bow-I84, the spring at its other end, resting in a stop I88 of a lever I81. This is provided with a small pin I88,*which tionatelylarge hole" I88, so that the lever I81 can execute swinging movements against the action I81 lies in a groove 288 of the shaft I12, and

slide I88 and thereby holds thisin its normal position, which isdetermined by means of the spring I88 and the. contact of the lever I81 on v The inclined edge I84A (Fgure 6b) of the slide I88,i"s so broad that itmay rotate the gear or pin gear 284 (Figures 6aand 16) which lies opposite to it at the operating the numeral wheels 288 .(Figures 1, 6a, 60 and 16, for 'a' whole division 'or a whole unit in the direction ofthe arrow 1n,

engagesin a propor-- arsenal direction of the arrow (Figure 6a). In the rotation of the shaft I12 in the direction of the arrow 7, the numeral wheels 288 ofthe revolution counter RC are operated in the additive sense. For this reason all the inclined surfaces of the transport pieces I84 to I84d and I88h to I845 (Figure 6b) are provided with the index A (addition) whilst those inclined surfaces of the transport pieces I88 to I840! and I84e to I84g,which in the rotation of the shaft H2 in the opposite direction to the arrow 1', rotate the numeral wheels 285 in the subtractive sense, are indicated by the index S (subtraction).

The slide I85 is in its construction exactly similar to the slide I88. In the rotation of the shaft I12 in the opposite direction to the arrow 9' the slide I85 acts in the opposite direction to the slide I88 on the star gears 284, i. e. the numeral wheels 285 are through it, rotated through one unit in the subtractive sense also in opposite direction to arrow m.

The right star wheel 284a. (Figure 6c) in each rotation of the shaft I12 rotates also the right numeral wheel 285, through one unlt (Figures 1 6a and 60) by means of the gear 288 (Figure 16) which through the sleeve 281 is rigidly connected with the star wheel 284, and engages with the gear 288. By means of a double toothed pawl 2880:, (Figure 17) the gear 288 is held in its rest position. In the transmission from 9 to "8" or from "0" to 9" the right numeral wheel 288 rotates the numeral wheel 285a of the next higher place through half a unit by means of the nose 289 (Figures Go, Go and 16) rigidly flxed' to the star gear 284a, and engaging with the toothed wheel 288a, whilst the rotation through machine frame, so as to form a stem 288.

engages, the otheifyend of the remaining half unit is effected by the obtaining transport piece I84a to I84:!' in a manner to be hereinafter described in more detail.

As the star gears 284 with the numeral wheels 285 are mounted in the displaceable carriage C the shaft I12 on the other hand is mounted in the machine frame, the slides I85 and I88 naturally only then act on the star gear 284a lying furthest to the right if the carriage C is situated in its extreme left position, i. e. in its rest position, as is 'thecase in addition and subtraction. If the-carriage C on the other hand e. g. is displaced one place to the right,- the slides I88 and I86 co-act obviously with the second star gear 284b (Figures 6a. and 60) from the right,-.

The displacement of the carriage C is only possible in the rest position of the shaft I12 which is determined by the stop pin I18. In this un-impeded through ly displaceable. To the same the addition key 4 is fastened by means of screws not shown. The downwardly directed end of the key stem 288 is of fork-like construction (Figure 18) and embraces with its forked part a. pin 288a, mounted on the guide for the key On one fork arm, a nose 248 is with which one end of a spring 24 I the spring being attached to the guide plate 288, whereby the key stem 288 is maintained in its rest position, which provided shaft I12 inthe is determined by-the face 242 of a lug 248, formed a shaft 25I by means of a screw 258,

on the key stem 239 striking against the under edge of the guide plate 238. On this lug 243 is, further, a pin 244 riveted, which acts on a face 245 of a shift lever 246 for shifting the reverse gearing I51, I29, I1I (Figs. 7, 8) for reversing the direction of the tens carrying shaft I12 (Figures 6a and 8) of the revolution counter RC, the shift lever 246 being disposed close to the left hand side of the key stem 239. The shift lever 246 is rotatably mounted on a shaft 241, fixed in the machine frame, and is provided with a face 246a, the aim of which will be described later. The shift lever-246 is of fork-shaped construction at its rearwardly directed part, and

embraces with the same a pin 249, provided on a lever 248. The lever248 is constructed of U- shape at its lower end and is rigidly clamped to On the shaft 25I (Figures 13, 19' and 28), a counter state control crank 252 is fixed on the right-hand outer side of the machine, which lever is provided with two triangular recesses 253 and 254 (Figures 19 and 20). With the recess 254 a pin 256, arranged on counter state control bar 255, constructed according to Figures 19 and 20, normally engages while with the recess 253 apin 251 fastened to said bar 255 may engage.

In the counter state control bar 255 an elongated hole 258 is provided, into which projects a pin 268, riveted to a lever 259 (Figures 19 and 20). The lever 259 is mounted rigidly on a rotatably mounted shaft 26I (Figures 1, 2 and 18). The free rearwardly directed end of said bar 255 (Figures 1, 2 and '1) is jointed to the swingable draw key setting bell crank I69 hereinbefore described, which controls the draw key I38, I63 of the change gear for the tens carrying shaft I12 of the revolution counter RC.

On the lug 243 (Figure 13) of the key stem 239, a pin 262 is further arranged, which acts on a face 263 of the lever 265, disposed immediately to the right of the key stem 239, and swingable on a bearing pin 264, in the clockwise direction. By means of a spring 261, which at one end engages with a notch 266 of the lever 265, and at its other end is attached to a pin, not shown, arranged on the machine frame, the lever 265 is held in its normal position as represented in Figure 13, which is determined by impact of the face 263 upwards against the pin 262 of the key stem arm 243. A lug 268 provided on the lever 265, may act on the lug 269 of a lever 218 (Figure 13) mounted so as to be loosely rotatable on the shaft 26I.

v To the fork shaped and right angled bent part of the lever 218 (Figure 13) the key locking bar 21I (Figures 13 and 18) is fixed. The latter is fastened on the left-hand side of the machine to a similarly forked and right angled bent part of a lever 212 (Figure 18). A pin 213 riveted to the rearwardly directed part of the lever 265 (Figure 13) projects into a right angled aperture 214, of a slide 215. The latter in its position for multiplication calculations represented in Figure 13, rests with its lug 216 on the already mentioned pin 239a, whereby the pin 213 which in the position represented'in Figure 13, engages with the aperture 214 of the slide 215, and the lever 265 is so acted on without the slide 215, that it can swing round the pin 264 in the clockwise direction. The slide 215 is atits forwardly directed end jointed to a U-shaped lever 211, by means of a pin 218. The pin 218 is fixed at one side into a limb 9, formed as a grip, and on the other side in a limb 288 of the U-formed lever 211. This is swingably mounted round the already mentioned pin 264. By means of a leaf spring 28I, fastened to the lower side of the guide plate 238 and V-shaped at its free end, the lever 211 and the slide 215 are held in the position in which they are set. These positions, corresponding to addition and multiplication operation respectively, are indicated on the portion from which the cover plate is removed with M and A respectively (Figures 1 and 2) In the one setting position of the parts 9, 215 according to the indication A the rearwardly directed end 214a of the slide 215, is acted on by the head I25 of the connecting rod I24, which is linked to the crank disc I I1, the head I25 in the rotation of the crank disc II1, so far displaces the slide 215 and therefore the lever 265, transversely to their own oscillation plane that the edge 263 of the lever 265 is disengaged from the pin 262 of the key stem 239.

For this purpose the bore of the bearing of the lever 265 relatively to the. diameter of the bearing pin 264, is chosen so great that the lever 265 is able to execute such a lateral movement. The direction of pull of the spring 261 is so chosen that the lever 265 with its horizontal edge 263, normally is held in contact with the underside of the pin 262 and against the lug 243. The lug 282 provided on the slide 215 sets on a part to be'hereinafter described.

Against the key locking bar 21 I, an arm 283 of a U-shaped lever rests which is swingably mounted on the shaft 241. To the downwardly directed arm 284g, a connecting rod 285 is jointed by means of a leaf spring and pin, and its other end is similarly jointed to a lever 286. By means of a spring 2840., which at one end engages with a nose 284b of the lever 284 and at its other end is attached to a pin, not shown, of the guide frame 238, the lever 284 is held in its rest position, which is determined through the impact of the face 289g, of the arm 289a, of a lever 289 on the machine frame. The lever 286 loosely swingable on the shaft 281 is rigidly connected by means of a bow 288 with the three armed lever 2'89 likewise swingably mounted on the shaft 281. In the rest position of the lever 284, the arm 289a, with its face 298 contacts with a roller 292 mounted on a lever" 29I. The lever 29I which is swingably mounted on the shaft 233 (Figures 3 and 13) is rigidly connected by means of a bridge 294, with a lever 295 likewise swingably mounted on the shaft 233. A spring 291 attached at one end to a pin 296 of the lever 29I and at its other end, to the machine frame in any suitable manner, acts on the lever 29I as well as the lever 295 in the clockwise direction round the shaft 233. Through contact of the roller 292 of the lever 29I, with the face 298 of the arm 289a, of the lever 289, the normal position is determined. On the upwardly projecting right angled bent end of the lever 295, the two-armed lever 22, previously mentioned is swingably mounted. This acts with the downwardly projecting limb on a contact spring 299 fixed to the angle piece 298. On the free end of this spring a contact pin 388 is fixed, which co-acts with a contact pin 382 fastened to an angle piece 38!.

The arm 2891) under the pulLof a spring 386, which at one of its ends is engaged with an arm 2890 of the three armed lever 289, and at its other end to a pin 383 of a right angled bent lug 384 of the clutch tripping dog 43, which is fixed on the shaft 281, is maintained in fixed connection with 'the clutch tripping dog 43,

whereby the. arm 2891) of the three-armed lever 239, lieson the top of the lug 306 of the clutch tripping dog 03. The other arm of said dog 33 as already described, co-acts with the clutches 25 and 52. O The key resetting device automatically opereting in each rotation of the main drive shaft 8, consists of the following parts.

The lug 282. (figures 13 and 14) provided on the slide 275 acts on a lug 29?, of a connecting w rod 3%. This is as illustrated in Figure 14 jointed to a lever Sid, swingably mounted at the poinh 3th on the machine frame. On the free end of the lever are, :2. lug 3 is formed by bending, on which acts anose 3&2, of a disc ms, rigidly 15 mounted on the tens carrying shaft is, Figure 11 of the accumulator. To the connecting rod 3% is attached a spring tit which at its other end is connectedto a lug did of a guide part 3G6, (Figures 1 and 2) rigidly mounted on the 24; machine frame. The angle lug Sui on the connecting rod 852, acts on an arm 8H (Figure 14) of the key resetting bar 3w, swingably mounted on the shaft 25L Further, the lug tii'l of the connecting rod 308 co-acts with an angle lever 25 323, swingably mounted on the shaft 2G?! (Figure 14) andadapted to coact with the key resetting bar for automatic key resetting operation ,in dependence of each rotation of the main drive shaft 3. Aspring' 322 is'attached at one of its ends to a nose 32i, of the lever 320, and at its other end is attached to a pin 323, fixed to the machine frame, and so acts upon the lever 326 that it always rests against a pin 324 mounted on the imachine frame. In order to shift the racks of the value entering mechanism from addition to subtraction and vice verse, 9. two armed lever 325 is rigidly mounted on the shaft 2M (Figure 13) which lever, with its upwardly directed arm, engages a 40 ring grooved sleeve 321, fixed on a pin 323, the pin 326 being guided in two bent lugs, 323 and 328 on the machine frame.

In addition, the pin 323, is coupled with the rack 33!! and in subtraction, with the rack 33I.

On the upwardly directed part of a subtraction stem 353 (Figure 13) vertically displaceable in the guide plate 233, (Figures 1 and 2) thekey 5 is attached by means of a screw, not shown. The downwardly directed end of the key stem 353 is of fork shaped construction, and embraces with its forked part a screw, not shown, in the machine frame, so as, to form a guide to the key stem 353 A spring 353, whichu is attached at one end to a nose 3!! of thekey stem'353, and at its other end is connected to the guide plate 233, holds the key stem, 383 in its normal position, which is "determined through the impact of the face 353 of the right angled downwardly bent part of thekey stem 383. on the under edge of the guide plate 233. On the lefthandside of'the lug 351, provided on the key stem 353, a pin 353 is face 243a (Figure 13) of the-shift lever 243, for shifting the reverse gearing I51, I23, III for reversing the direction of the tens carryingshaft "2 (Figures 6a and 8) of the revolution counter RC. On the right hand side of the lug 351 of the key stem 353, a further pin 333 is provided, which acts on the edge 233 of the already mentioned lever 235. L

On the beam I32 mounted on the carriage C a flap 803, for resetting the preparing slides 383' for. tens carrying and locking the same in the resetting position, is swingably mountedin the hubs"! (in Figure 13 only the right hub Q" is ber 553,-

of the next higher decimal riveted, and acts on the For greater visible). On said flap a ledge forming projection car is provided, of which the and Mia which projects to the right lies againsta lug 6080. of a lever tilt swingably mounted in the machine frame. The lug Sada of the lever 62B, co-acts alternately with the noses 809 and 669a, which are provided on a hub 30912 of the coupling wheel frame I 35 carrying the coupling gears W3,

and serves for the locking of the flap 625.

The preparatory members 559- are, on their upper sides, provided with notches 5599 and 55%, in which a ball 55%, (Figures 15 and 21) may engage. The ball 559k is disposed in a hole of the cover bar 559m and is by the arm 55371, (Figare 21) of a spring mp, continually acted on against the preparatormmember 559, whereby this in the one or other and positions determined by the notches -559g and 5537; can be blocked. In order to prevent the sliafts 556 and the preparatory members 559 escaping out of their positions, the shafts 556 and the preparatory members 559 are covered with the cover bar 559m, which is fastened by means of screws 5591' to the bearing beam I32. with the',edge 5538,

the preparatory member 533 may act on the inclined face I 33g of the tens carrying member I33. The tens carrying members I33, which may have the form illustrated in Figures 22 and 23,

are guided in grooves I 33h and I33k which are arranged transversely in relation to the two bars I33m and N312. arranged longitudinally on the bearing beam. The grooves I33h are somewhat wider than the tens carrying member I33 itself, so that the member I33 can be swung to the left (as seen in Fig. 18) or to the right respectively (as seen in Fig. 22) and so its nose I333: can engage with the toothed-wheel 538 of the numeral 'wheel 5 of the next higher decimal place. Of

this swinging movement consideration is also taken by means of corresponding clearance of the tens carrying members in the groove I 331:. A lug I'33r limits the upward and downward strokes of the tens carrying member I33. The tens carrying members I33 are prevented from falling out by a'cover bar I32z- (Figure 15) The leaf springs 553p, fastened to the cover .bar 333m, by meansof screws 558w, and as above mentioned with their arms B'ML on the balls 553k, act with their other arms on the edge I 33s of the tens carrying member I33, and hold the same in their lower vertical position as shown in Figure 22.

The tens carrying member I33,- which has the form as shown in Figure 23, is in its-,upward movement-swung to the left by the edge 533s (Figure 15) of its appertaining preparatory memso that its nose I331: can engage with the toothed wheel 553 of the numeral wheel I" place and rotate this one unit further round. Y 1

, "osm um or me d d n they known,,first the termis set on the keyboard K (FiguresLand 2) whereby the setting wheels indicated with RI upto R5 (Figure 18) are brought into eng gement-with racks of th ;.value entering mechanism corresponding to the individual place values of the terms.v

' In order 'now on the depression of'the addition key 4, (Figure 13),///to obtain in each case only one rotation, the/lever '3 is first swung out of the position illustrated in Flsure 13, into the position represented in Figure -1, consequently on to the markA. With this the rod 215 Jointed purpose of performing addition as to the lever 3 by means of the pin 218 is displaced in the opposite direction to the arrow a, whereby the pin 213 of the rod 265 extends into the closed end of the slot 214g, so that in a downward movement of the rod'265, the rod 215 is also taken downwards along with it. When the setting of the lever 9 on the mark A is effected, the addition key 4 is depressed.

In the depression of the addition key '4 (Figure 13) the pin 244, riveted on the lug 243, acts on the face 245 of the shift lever 246, and swings this in the anti-clockwise direction into the position represented in Figure 13. With this the shift lever 246, of which the fork-shaped end embraces the pin 249, swings the lever 248 rigidly mounted on the shaft 25I in the clockwise direction, and therefore rotates the shaft 25I. The counter state control crank 252 likewise rigidly mounted on the shaft 25I is thereby swung in the clockwise direction into the position illustrated in Figure 19, whereby the stop 254a of the recess 254 acts on the riveted pin 256 of the counter state control bar 255. With this the pin 251 of said bar 255 and the side 253a of the recess 253 move in relation to one another. The recess 253 is besides naturally kept so great that the pin 251 and the edge 253a cannot interfere with one another. The counter state control crank 252 now displaces through its swinging movement in the clockwise direction, the bar 255 in the direction of the arrow 0 (Figures 19 and 2). This swings in turn the draw key setting belt crank I69, I61 (Figure '7) in the anti-clockwise direction round the pin I68, whereby the arm I61 of this which engages in the ring groove I18 of the draw key I38, I63, displaces the latter so far to the right .that the nose I63 thereof enters into the groove I6I of the gear I51 and couples therefore the latter with the gear I1I rigidly connected with the draw key sleeve I56, whilst the gear I29 may then run idly on the draw key sleeve I56. The change gear for the revolutioneounter RC is also therefore shifted to addition.

In the rotation of the shaft 25I (Figure 13) in the clockwise direction, the coupling pin 326 is by means of the lever 325, displaced in the direction of the arrow a whereby the rack 330 is blocked, and therefore the value entering mechanism is set for additive operation according to Figure 13.

During the coupling of the gear I51 (Figure 7) with the draw keysleeve I56 and the coupling of the rack 338, by means of the pin 326, on the depression of the addition key (Figure 13) the pin 262 riveted on the part 243, acts on the upper edge 263 of the lever 265, and swings the.

same against the action of the spring 261 in the clockwise direction. Since on the setting of the lever 9 for addition indicated A the rod 215 has been displaced in the opposite direction to the arrow a (Fig. 13) the pin 213 of the lever 265 is in engagement with the slot 214g of the rod 215. The lever 215 is consequently also swung in the clockwise direction and of course round the pin 218, so that the part 21411., (Figure 13), reaches into the path of movement of the connecting rod head I25 of the connecting rod I24.

In said swinging of the lever 265 (Figure 13) in the clockwise direction, round the pin 264, the projection 265a, of the lever 265, is positioned before the edge 21Ia. of the key locking bar 2H, andof course, to the right of the lever 218. On the lug 26,9 of the same, the projection 268 of i the lever 265 acts whereby the lever 218 is swung in the anti-clockwise direction round the shaft 26I. In this swinging movement, also, the key locking bar 21I takes part without being prevented by the projection 265a. This locking bar remains then with a small amount of play distant from the projection 265a. and acts on the lug 283 of the lever 284, whereby this is swung in the clockwise direction round the shaft 241. With this the connecting rod 285 jointed to its downwardly directed limb is displaced in the opposite direction to the arrow a and consequently the lever 286 jointed to it, swings round -the shaft 281 in the clockwise direction, whereby the face 290 of the arm 289a, of the three-armed lever 269 acts on the roller292 of the lever 29I and this as well as the lever 295 connected to it by means of the bridge 294, swings against the action of the spring 291 in the anti-clockwise direction round the shaft 233, whereby the contact lever 22 is displaced in the opposite direction to the arrow a and the arm 2I of the lever 22 which normally through the action of the spring 295b is brought into contact with the conical periphery 23 of the cam 28, slips off from this. The contact lever 22a can now under the action of the spring 2952), swing in the anticlockwise direction, whereby under the action of the contact spring 299, the motor contact 300 and 382 is closed. The motor D now commences to run in the direction of the arrow el and rotates the main drive shaft 3 by the worm I disposed on the motor shaft through the worm wheel 2, in the direction of the arrow e. The spring 396 engaging with arm 2890 of the lever 289, swings then the coupling clutch tripping dog 43 and the shaft 281 in the direction of the arrow el (Figure 4) whereby the nose 10 of the clutch 52 is released. The trip pawl 65 (Figure 9) under the action of its spring 59, is thereby operated so that its nose H is brought into engagement with the tooth 45, of the coupling cam 26, fixed to the main drive shaft 3, whereby the cam 26, said pawl 65 and therefore also the clutch housing 52, in vhich the clutch pawl 65 ismounted by means of the pin 66, are carried along in the direction of the arrow e. The clutch tripping dog 43, is prevented from making a backward movement by the cam 52a: of the clutch housing 52, so that an eventual swinging of the clutch tripping dog 43 in the opposite direction to the arrow el, which could arise through accidental pressure of another operating key, is prevented. The gear 56 (Figure 4) which is in rigid connection with the coupling 52, by means of the screws 55, and the hub 51 provided on the gear 56, is thus rotated in the direction of the arrow e.

- The spur wheel 16 (Figures 4 and 11), which is disposed vertically over the gear 56, and engages with it, is thus rotated in the direction of the arrow 1. As the bevel gear 19 formed on the gear 18, engages with the bevel gear I21, this is rotated in the direction of the arrow i. In this rotation, the gear I28, rigidly mounted on the shaft I9, likewise participates. This transmits the rotational movement through the gear I8I (Figures 4, 6 and 8) and through thegear I83 rigidly connected with the latter by means of the sleeve I82, to the gear I 51, which, as formerly mentioned, in the depression of the addition key 4, is coupled through the draw key I30, I63 with the draw key sleeve I56, so that consequently also the gear I1I rigidly connected with this, rotates in the direction of the arrow i. As this in turn is in engagement with the gear I13 (Figure 6a) &

fixed to the tens carrying shaft m, so the tens carrying shaft I72 of the revolution counter RC rotates in the direction of the arrow 7' (Figures III 2, 16 and 6a). (Figures 6 and 6a) of the lug I86 (Figures 6b and 6d) acts on the tooth 20611,! (Figure 6a) of the star wheel 20611, (Figure 6a) positioned furthest to the right in the carriage C and rotates this in the direction of the arrow it (Figure 6a) to the position of the tooth 2861:, for a complete division. merit the transport piece I85 enters into the toothed space lying opposite to it of the star gear 20 5a, whereby this is secured against further rotation. By means of this rotational movement of the star gear 206a, through one division, the toothed wheel 2% (Figure 60) standing in fixed relation with the star gear likewise rotates in the direction of the arrow k, and as this is in engagement with the toothed wheel 208, fixed to the numeral wheel 295 of the revolution counter RC, so this and with it the numeral wheel 205 rotate in the arrow direction m, i. e. in the additive sense for a whole unit. As may be seen, the subtraction lug I86, I85 with its notch I85c-corresponding to the notch I98 (Fig. 6d) of said lug I86, stands in the way of said shifted tooth 2962/, the position of which corresponds to the position of tooth Edda: (Fig. 6d). Consequently the lug I85 is pressed back against the action of its spring by the coaction of the tooth 2633/ with the notch H50 towards the end of the rotation of the shaft I12. A rotation of the star wheel 204a: cannot thus take place in consequence of the positive guiding given by the notch I850 and the transport piece I8 3, of the already shifted star gear 28 3c.

. If now the numeral wheel 295 situated furthest to the right of the revolution. counter RC has arrived at the value "9 so must in'the transition of the same from 9 to a tens transference in the numeral wheel 205a-disposed close to the left take place. This happens in the following manner.

In the change from "9 to "0 of the numeral wheel 205 disposed furthest on the right, a shift nose 2209 (Figures 6c and 6a) fixed on a sleeve 20? (Figures 60 and 16) acts on the gear 208a, which is rigidly connected with the next higher numeral wheel 205a. The numeralwheel 2050 has still only rotated through one half-unit and likewise the gear 208a rigidly connected with the numeral wheel 285a. As the gear 2080. is in engagement with the toothed wheel 206a which is rigidly connected with the star gear 206b, belonging to the next higher place, so naturallythis is also rotated through one half-unit. In this position set on the half division, the star gear 28% is held through engagement of a double tooth pawl 20th: (Figure 17) in the tooth space of the gear 268. In this rotation of the star gear 20% for half a unit, the pin 2M0 of the same enters the rotational part of the inclined surface I8IaA (Figure 6b) of the transport piece Idea. whereby in the rotation of the tens carrying shaft I72, the star gear 2M?) as well as the numeral wheel 268s. are shifted round through the still lacking'half unit. In a similar manner, naturally, the tens transfer to each next higher numeral wheel is I also effected.

i shortly explained. As above mentioned. on the On this the inclined face IB iA Immediately after this rotational movedepression of the addition key 4, the shaft I I6 (Figures 4, 11 and 13) rotates in the direction of the arrow f, whereby through the crank disc II I, which is fixed to the shaft H6, and the connecting rod I24 jointed to the crank disc and indicated by 85 in U. S. Patent 1,011,61'7' the proportional lever which is not illustrated here, is swung out, which moves the system of differentially movable racks "(indicated in Figure 18).

The movements of the racks of the value entering mechanism are then through the wheels RI to R brought into engagement with the racks by the value keys K transmitted to the shafts Him, whereby also the gears I54 fixed on these shafts corresponding to the set value rotate forwards and backwards. In order to transfer only the forward rotation to the gears I55 of the numeral wheel shaft 556 and thus to the numeral wheels 554 of the accumulator A a coupling is introduced, between the gears I54 and the gears I55, of which the operation will be shortly explained in the following.

On the left hand side of the machine, on the tens carrying shaft I9 (Figure 11) the pin gear I35 is rigidly mounted, which corresponding to the rotation of said shaft I9 is likewise rotated in the direction of the arrow 2. The pin gear I34 now rotates the Maltese cross I39 by means of the pins I57 (Figure 12) so far in the direction of the arrow i until the locking piece I38 of the pin gear I34 acts on the locking curve I39a of the Maltese cross I39. In therotation the gear MI formed on the Maltese cross I 39, the gear I433 engaging with the latter and the gear I46 standing in engagement with the gear I43 also take part. Then the coupling gears frame I 35 carrying the coupling gears I53 (Figures 11 and 18) rigidly connected with the gear M5, is rotated in the direction of the arrow i whereby the coupling gears I513 engage with the driving gears I56 (Figure 1B) and the register gears I55. After this drive connection has been established the racks of the value entering mechanism transfer through the shafts I54a, gears I54, coupling gears I53, and gears I 55, the set amount to the number rolls 55d of the accumulator A.

During the swinging movementv of the coupling gears frame I65, the nose 609 (Figures and 18) rigidly connected with it, has released the lever B08, whereby this in consequence of its own weight likewise swings out in the clockwise direction its lug 608a, releases the ledge of the resetting or locking flap 608, so that this swings in anti-clockwise direction round its pins 606a,

and unlocks the finger 559a of all the preparatory members 559.

After these operations have taken place, the value transference to the gears I of the numeral wheel shafts .555 is efiected by the gears I54 through the coupling gears I53, whereby naturally also the numeral wheels 554 are correspondingly rotated and, of course, in the direction of the'arrow L (seen in Figure 18).

In this value transference, as soon as one of the numeral wheels 554, shifts from 9" to 0, the tens carrying nose I559 of the gear I55 acts on the inclined face l55b, of the preparatory member 559 and displaces the same in the direction of the arrow PI. This displacement movement of the preparatory member 559 may execute unimpeded in consequence of the preceding release of itsfinger 559a by the resetting or looking flap 8G8. In the displacement of the preparatory member 558, in the direction of the arrow Plthe ball 55810 is disengaged from the stop 5599' and engaged in the stop 5431i, whereby the preparatory member 559 in its new position, the working position, is blocked.

By means of this process, the edge 559s of the preparatory member 559, has entered into the part of movement of inclined edge I530 (Figure 23) of the tens carrying member I33.

As soon as the value transference has' been eifected the coupling gears fra'me I45 is rotated further in the clockwise direction, "whereby the coupling gears I53 are again disengaged from the gears I54 and I55. Meanwhile, however, the tens carrying shaft I9 with the eccentrics I3 IE rigidly connectedwith it has rotated so far in the direction of the arrow i that the eccentric I3IE arranged in the units position acts on the foot I331: of its tens carrying member I33 and raises this. Insofar now as the appertaining preparatory member 559 has experienced no displacement in the direction of the arrow PI the tens carrying member I33 is solely inoperative, i. e. vertically raised. 1

If it is now assumed that the above described displacement movement of the preparatory member 559 has taken place in the tens position here the edge 559s (Figure 15) of the preparatory slide 559, also is disposed in the path of the inclined edge I339 (Figure 23) of the appertaining tens carrying member I33. As soon now as the eccentric I3Iz, arranged in the tens position acts on the foot I331: of the tens carrying member I33, this is raised.

Then it strikes with its inclined edge I339 on the edge 559s (Figure 22) of the preparatory member 559 and slides off in consequence to the right as illustrated in Figure 22, whereby it with its lug I33p, engages with the gear 558 of the next higher numeral wheel 554, and rotates this for one unit further. After the gear 558 has been shifted through one unit further, the eccentric arranged in the hundreds position comes into operation, and raises the corresponding tens carrying member I33 upwards. If all the eccentrics I3I have now come into operation in the direction of the arrow i on their tens-carrying members I33, so are these through the shape of the eccentrics I3I for a time held in their raised positions. Meanwhile, the coupling gear frame I45 has so far rotated in theclockwise direction that now the nose 509a of the same acts on'the lever 608, and swings the latter round its rotational point 9982; in the anti-clockwise direction (Figure 15). The lever 608 strikes then on the bar 901 of the resetting or looking flap 606 and swings this round its pins 606a in the clockwise direction. The resetting or looking flap 605, now comes into contact with the fingers 5592 of the preparatory member 559 and so acts upon them that all the preparatory'slides 559 are displaced in the opposite direction to the arrow PI and take up their rest position as indicated in Figure 15. The halls 559k are then disengaged from the stop 55911. and engaged in the stop 5599, and the resetting or looking flap 596 acts again therefore as a locking flap so that all the preparatory slides 559 are secured against a movement irr'the direction of the arrow PI.

As soon now as the preparatory members 559 have again taken up their rest position illus-q trated in Figure 15, their edges 559s have released the tens carrying members I33 so'that these under the action of their springs 5591) (Figure 21) are again swung to the right, whereby their lugs I33p are disengaged from the gears.

m. Only then, the eccentrics m release ,simultaneously all their tens carrying members I33, so that these under the action of their springs 559p, can descend-vertically into the rest positions, whereby all the parts take up the position to one another shown in Figure 15.

As the preparatory members 559 in this manner are held for the longest possible time in their working position, and the release of the tens carrying members I33 takes place only at the last instant, so a pronounced coming to rest of the lugs I331) of the tens carrying member I33 in the tooth spaces of the gears 558 is obtained whereby any overthrow movement of the same is securely avoided.

The locking of the preparatory slides 559 in the rest position of the machine according to Figure 15, has, the object to avoid an over-rotation of the numeral wheels from 9 to or vice versa in setting by means of the whorl W.

As already described on the depression of the addition key 4, the key locking bar 2' (Figure 13) is swung in the anti-clockwise direction, whereby it contacts against the projections I4a of the key locking bars 5I4 (Figure 18) so that it isnot possible to depress a key K. In order also to maintain this locking during the calculating operation, independent of the holding of the addition key 4 depressed the following arrangement is provided.

After the depression of addition key 4, the crank disc III (Figures 13 and 18) actswith its surface on the lug 'I I'Ih of the lever M1111, and swings the same and the lever IIIp rigidly connected with it, in the clockwise direction, round the shaft Us. With this the lever 11) now places itself upwards against the key locking bar 2H and prevents the depression of a key during the calculating operation.

As already described, the lever 265 (Figure 13) is swung on the pressing of the key 4, against the action of its spring 261, in the clockwise direction. As through its swinging movement, through the parts 269, 219, 2', 284, 285, 286 and 43, (Figures 4, 5 and 13) the clutch 52 for the value entering mechanism is closed and through the parts 292, 29I, 295 and 22a the motor contacts 300, 392 are closed, so these parts naturally remain closed so long. as the key 4 is held depressed. Consequently, when the key 4 is held depressed unintentionally, the amount set is unintentionally repeatedly transferred to the accumulator A. In order to avoid this, precautions must be taken that also in the holding of the key 4 in the depressed position, the machine only makes one revolution. With this object in view the levers 255 and-215, as already mentioned, are so positioned that, after approximately half a rotation of the crank disc III, they are pushed by the connectingrod I24, (as is shown in Figure 13) to the right (considered from the front of the machine),' and of course so far that they, under the pull of the spring 261, engaging with the lever 255, can rise so high laterally of the pin 262 of the key stem 239 that the projection 255a of the lever 255 contacts with the edge 2IIa of the key locking bar. If the key 4 by mistake is freed and again depressed, it remains inoperative on the lever 255 as it cannot be engaged by its pin 25-2.

As soon now as the lever I IIm (Figures 13 and 18) can again engage with its nose Hlh in the groove I Ilg of the crank disc I I1, the key lockin bar 2' is able under its own weight and by the 

